Device for alternately filling and emptying measuring vessels



Feb,f 4, 1930. v1,745,387 DEVICE FOR ALTERATELY FILLING AND EMPTYING MESUHINGI VESSELS H. STREHLER Filed March 8, 1928 v INVENToR. HANS STfH/.E/Q.

ATTORNEY.

Patented Feb; 4, 1930 PATENnoFFIcE f i HANS STREHLER, OF LYSKS, lSVIITZERIil-LII'I) v DEVICE FOB, ALTERNATELY FILLING ANDl EMPTYING MEASURING- VESSELS Application filed March 8, 1928, Serial No.

My invention relates to an automatic change-over'device for use in alternately lling and emptying vessels filled under pressure, wherein a reversing member actuated by e, 5 the said pressure serves for connecting the measuring vessels with the pressure and discharge pipes.

The invention has for one of its objects to providean improved device of this kind so l constructed that the reversing` mechanism shall not be contacted by the liquid in the apparatus.

According to an important feature of the invention the change-over member for actu- 15 ating a rotary valve that is operatively connected with it and controls the pressure and discharge pipes, is reciprocated by two diaf Vphiagms which close each a chamber, which 'chambers are connected with the two connect- 2-0 ing pipes between the rotary valve and the measuring vessels.

'The invention ,consists in the construction,

yarrangement and combination of parts described hereinafter and pointed out in the claim.

One embodiment of theinvention is diagrammatically illustrated by way of example in the accompanying drawing, wherein Figure lisa vertical section taken through 30 one form of apparatus according to the invention, and

F igure' 2 is a front elevation, partlyin section, as viewed from the left-hand of Figure 1;

Like. reference characters designate llike 35 parts in both'views.

According to the drawing, a four-way rotary valve comprises a valve casing 1 and a vValve in the form of a plug 3 that is normally held seated by a spring 2. Mounted on the valve casing 1 is another casing 4 wherein a f yshort axle` 5 is mounted coaxially with the said plug. The head 3 of the plug is fixed by a cotter pin 7 in a bushing 6 and abuts 1n the latter against one end of the axle 5, the abutting faces of the same lying aslant to the longitudinal axis of the spigot, so that by turning the axle 5, which is held against axlal displacement by a. thrust ball-bearing 9 providedat its end remote from the spigot, the 50 latter can be lifted from its seat against the 260,087, and in Switzerland April 21, 1927.

action of the spring 2, to facilitate the turning of the valve.y

' Elbows'12 are connected to two lateral tubular branches 10 and 11 of the valve casing, which elbows carry the two measuring vessels '13 and 13"which are to be filled alternately, the same being indicated in Figure 2 yin thin lines. The pressure pipe of ya pump is connected to the branch 14, and a discharge pipe 16 is connectedto the branch 15.

A crank arm 17 is fast on the axle 5 and has its free end bent towards the front (see Figvure 1, left-hand); this end carries an antifriction roller which serves for actuating a lever 19 of a counter mechanism that is mounted on a cover 20 of the casing 4 and does not belong to the present invention. The axle 22 of the roller 18 has its upper end formed as an eye 22 connected with a spring 23 which serves to move the crank arm 7 17 out of its middle position into the one or other end position and to hold lit therein. These two end positions of the arm 17 lie 90 kapart and are limited by stops 24.

The casing l has its two sides closed each bya diaphragm 25 and cap 26, which form two chambers 27 and'28, one at each side. The chamber 27 is connected by a duct 29 witha lateral branch pipe (pipe connecting valve and measuring vessel), and the chamber 28 is connected by a duct 30 with the other lateral branch pipe ofv the valve-casing, so that the filling pressure acting in the respective measuring vessel is transmitted into'the respective chamber 27 or 28 and bulges inwards the diaphragm 25 closing the respective chamber, as shown in Figure 2 at the left hand.

Between the two diaphragms 25 the reversing member for the valve has the form of a rod 31 which is slidable axially in two bearings 32 and has at each end a disc 33 having a Vdomed outer face. Fast on the rod 31 between the two bearings 32 is a fork 34 into which extends with sufficient play an arm 36 of the crank 17 carrying an anti-friction roller 35. The two bearings 32 limit the stroke of the rod 31.

The described reversing device operates, briefly, as follows The measuring vessels are filled under pressure, and as shown in Figure 2 the vessel 13 is to be filled. When it is full and under pressure the diaphragm 25 Will be bulged to the right by the pressure which Will also act in the chamber 27, whereby the rod 31 will be sbiited more than hali its stroke to .the right. By meanssof the appropriate arm, of the fork 34 the crank 17 is rotated to the right against the action of the spring 23 a little beyond its middle position. Y The springv2'3 then rotates the crank 1 7 into the other end position indicated by a broken line in Figure 2, play in the fork 34., permitting this movement. The valve is thereby reversed, so that thev measuring vessel 13 is placed.- in communication with the discharge pipe,and the; meaSur-ing vessel. L3. Withthe delivf'ery pipe of the pump. When the vvalve isV reversed the counter is, also,A actifiaterfl'. TWhen the measuring vessel 13 has been filled, the described cycle of operations commences afresh..y

As cor-ripared` with known reversing devices having a piston, blade or vane serving as re-V veirsingmember, the describedandillustratcd reversing device. has. the advantage that the reversing mechanism doesnotcome into contact with the; liquid and apart from the stung box. ofi the axle. 5, there are no mov.- ablerparts that require to be packed. ln order to: avoid places at the diaphragms which might become leaky, disconnecting rod4 3lV is, not rigidly connected with them,

Various modiications. mayy be madey in the detailsy of construction described above. with out. departing fromv the scope of the invention.,

I claimlg- InV apparatus. of thei character described, the combinationl of a rotary valve having4 a crank arm for operating vthe same., Vpressure and discharge pipes controlled by said valve for vCommunicating with vessels. to be alter-y i nately filled under, ypressure and emptied,itwo chambers connected each with a. pressure pipe, which chambers. are; closed each, by a diaphragm arranged facing the otherV dia.- phragm, a reversing member 1n the, form, of an endwise movable rod arranged to be reciprocated by ysaid diaphragm, said rod carrying ay fork into, which said crank armv extends With play, and a means connected to said crank arm tending to hold they same in f either of its. end positions corresponding to the end. `positions of saidY rod.

In .testimony whereof laix myfsignature.

.HANS STREHLER. 

